Top 5 Campus Printing Mistakes and How to Avoid Them

Campus printing is supposed to be quick and stress-free. But in the rush to submit an assignment before a deadline, simple oversights can lead to printing failures, formatting disasters, and wasted paper or money. Understanding the most common mistakes — and knowing exactly how to avoid or recover from each one — makes your MIMO printing experience seamless every time.

At MIMO, we have designed our self-service kiosks and mobile dashboard to guide you through every step of the process. But awareness is the best prevention. In this detailed guide, we will cover the most frequent student printing mistakes, explain exactly why each one happens, and provide practical, step-by-step solutions to prevent them before they affect your day.

Mistake 1: Uploading the Wrong File Format (and Not Checking Layout)

The most common and costly printing mistake is uploading a Microsoft Word (.docx) or Google Slides file without first converting it to PDF. While MIMO's cloud processor accepts Word and PowerPoint files and converts them automatically, there is an inherent risk in this conversion: font substitution.

If your document uses a custom font that the conversion server does not have installed (such as premium design fonts or downloaded third-party typefaces), the server substitutes the nearest available system font — typically Arial or Times New Roman. This substitution changes character spacing, which can cascade across the entire document, causing:

• Lines of text rewrapping incorrectly, pushing sections onto the wrong pages.
• Headers appearing on blank pages while the content sits elsewhere.
• Tables overflowing their column boundaries.
• Math equations rendered as placeholder squares.
• A 10-page document suddenly becoming 12 pages.

The Fix: Always export your document as a PDF before uploading. Open the PDF on your phone to visually verify the layout on a few pages before paying. Ensure your page size is A4 and margins are at least 1.27 cm on all sides. Once you've confirmed the PDF looks correct, your printout will match exactly.

How to Export to PDF:

• Microsoft Word: File → Save As → PDF. Or File → Export → Create PDF/XPS.
• Google Docs: File → Download → PDF Document (.pdf).
• PowerPoint: File → Export → Create PDF/XPS. Make sure to set slide size to A4 first under Design → Slide Size.
• Google Slides: File → Download → PDF Document (.pdf).

Mistake 2: Going to the Wrong Kiosk for Colour Prints

MIMO kiosks on campus are not all identical — each physical terminal has a specific hardware configuration. Understanding which kiosk has which printer is essential for getting the right output, especially for colour jobs.

• Kiosk CV-001: This is a high-speed monochrome laser printer terminal, configured exclusively for black & white laser prints. It is the fastest kiosk on campus, capable of spooling a standard 10-page document in under 8 seconds. However, it cannot process colour print jobs.
• Kiosk SV-002: This kiosk is equipped with dual printers — a monochrome laser printer for B&W jobs and an Epson inkjet printer for full-colour output. All colour print jobs must be collected from this kiosk specifically.

If you purchase a colour print job but go to CV-001 to collect it, your print code will not work there. The code is linked to a specific kiosk configuration. Conversely, if you accidentally select the wrong kiosk ID during checkout, contact support immediately — do not enter the code at the wrong kiosk.

The Fix: Before confirming your print job and paying, look at the kiosk selection screen in the MIMO dashboard and make sure you choose the kiosk you plan to physically walk to. For colour prints, always select SV-002. Verify the kiosk ID label on the physical terminal before entering your 4-digit code.

Mistake 3: Uploading Oversized Files Over Mobile Data

Students frequently try to upload scanned booklets, high-resolution photo collections, or presentation files with embedded 4K images that result in PDF sizes of 40MB, 60MB, or even larger. While MIMO's servers can technically receive these files, uploading them over a 4G mobile data connection on campus creates several problems:

• Slow upload times: A 50MB file over a typical campus 4G connection (3–5 Mbps) can take 80–130 seconds to upload — during which you're standing waiting, or the connection may drop and force a restart.
• Slow kiosk download: The Raspberry Pi kiosk controller then needs to download this large file before it can spool it to the printer. A 50MB file can take 45–60 seconds to download over Wi-Fi, creating a delay between code entry and paper output that can confuse or frustrate students who expect near-instant printing.
• Potential timeout errors: Very large files may exceed the kiosk's local processing timeout, causing the job to fail even after a successful upload and payment.

The Fix: Before uploading, compress your PDF to under 15MB using free tools:

• ilovepdf.com/compress_pdf: Free, fast, browser-based. No registration required. Reduces file size by 60-80% with minimal visible quality loss for standard documents.
• Smallpdf.com: Similar free compression tool with a clean mobile interface.
• Adobe Acrobat Reader (mobile): Has a built-in Reduce File Size option in the free version for PDFs under a certain size.
• Google Drive: Uploading to Google Drive and then downloading as a Google-compressed PDF can sometimes reduce file size automatically.

Also, whenever possible, upload on campus Wi-Fi rather than mobile data. Campus Wi-Fi typically offers 20–50 Mbps speeds that reduce a 15MB upload to under 3 seconds, making the experience instant.

Mistake 4: Walking Away During Colour Inkjet Printing

Black & white laser prints are genuinely near-instant — a standard 10-page document is typically fully ejected in under 8 seconds from the moment you enter your code. However, colour inkjet printing operates on a fundamentally different technology and timeline.

Inkjet printers (like the Epson L3250 at SV-002) use liquid ink deposited through microscopic print heads that must be precisely aligned and primed before each print session. After a period of inactivity, inkjet printers run an automatic maintenance cycle that includes:

• Print head cleaning — flushing ink through the nozzles to clear any dried residue.
• Nozzle alignment calibration — ensuring all colour channels are precisely aligned.
• Ink level verification — checking that all four cartridges have sufficient ink.

This initialization cycle takes approximately 25–40 seconds. During this time, the kiosk progress bar may appear to reach 100% while no paper has yet emerged from the output tray. Many students interpret this as a print failure and walk away — leaving their colour prints uncollected in the output tray, where other students may pick them up.

The Fix: When printing colour documents, wait at the kiosk until physical paper appears in the output tray. The MIMO kiosk screen displays a status message like "Inkjet initializing — please wait 30 seconds" or shows a countdown timer during the maintenance cycle. Never walk away until you physically see your pages ejecting or the screen confirms completion. If more than 90 seconds pass without any output and the screen shows no activity, press the Help button on the kiosk screen.

Mistake 5: Panicking When the Printer Jams or Fails Mid-Job

Hardware failures happen — paper jams, toner running out, connectivity issues, or the printer going offline unexpectedly mid-job. When this occurs, students sometimes assume they have permanently lost their money and spent the next hour trying to find a staff member to help them.

The reality is much simpler and more reassuring than most students expect. MIMO's Raspberry Pi kiosk controller monitors the CUPS (Common UNIX Printing System) print queue status in real time, every few seconds. When a hardware error is detected:

1. The Pi listener immediately detects the CUPS job status changing to "error" or "aborted".
2. It updates the print job status in our Firestore database to "failed".
3. Our backend Cloud Function triggers automatically and calls the Cashfree Refund API within seconds.
4. Your original payment method (UPI, debit card, or net banking) receives the full refund within 5–7 business days, depending on your bank's processing time.
5. You receive a "Refund in Progress" notification visible in your MIMO dashboard under your print history.

The Fix: Do not panic. Do not attempt to re-enter your print code at another kiosk — this could cause a second charge. Simply open your MIMO dashboard on your phone and check the status of the print job. If it shows "failed" or "refund in progress", the refund is already being processed. If the dashboard shows "processing" for more than 5 minutes with no output from the kiosk, contact MIMO support.

Bonus: Other Common Issues Students Encounter

Beyond the top five, here are several other mistakes worth being aware of:

• Expired print codes: Your 4-digit code is valid for 24 hours from time of purchase. If it expires, your file is automatically deleted from our servers and a full refund is issued. You will need to re-upload and pay again for a fresh code if you still need the printout.
• Wrong page count: Always check the page count shown in the MIMO dashboard after uploading. If the count seems unexpectedly high, open your PDF and look for accidental blank pages, particularly at the end of the document.
• Selecting duplex for single-page documents: Enabling double-sided printing on a 1-page document has no effect (there is only one side to print), but it's good practice to turn duplex off for cover pages or single-sheet documents to avoid confusion.
• Uploading password-protected PDFs: MIMO cannot process PDFs that have owner-level printing restrictions or password protection. Remove the password using tools like ilovepdf.com before uploading.
• Missing your file after upload: If you accidentally close the browser mid-upload, your file may not have completed uploading. Always wait for the upload progress indicator to show 100% and display a file confirmation before navigating away from the upload page.