Prototype of coffee proof "see through" single layer on top of Raspberry Pi400 keyboard for typing

prusaprinters

<p>My Pi400 did survive coffee on+in keyboard in February:<br><a href="https://forums.raspberrypi.com/viewtopic.php?t=329833">https://forums.raspberrypi.com/viewtopic.php?t=329833</a><br>&nbsp;</p><p>This model is proof of concept for coffee proof layer on top that still allows typing, and “see through” the printing of keyboard keys.</p><p>While all 12 language keyboard layouts differ …<br><a href="https://datasheets.raspberrypi.com/rpi400/raspberry-pi-400-product-brief.pdf">https://datasheets.raspberrypi.com/rpi400/raspberry-pi-400-product-brief.pdf</a><br>… TAB and Q keys are at same location for all of them. So I chose these two keys for proof of concept,</p><p>Started with 1.6mm measured height above keyboard plate, but with that pressing key was not 100% working. So reduced height to 1.4mm above keyboard plate. That way pressing key does work. Single layer (all Prusa MINI+ first layer heights are 0.2mm regardless of quality chosen), and at least with white PETG you can see the printing on the keys. I think you can buy filament that allows to see through even better.</p><p>Regarding coffee/water proof, I did water on the inside of poc print for an hour, and the dry paper below kept dry — so this single layer print is water proof (2nd photo).</p><p>&nbsp;</p><p>P.S:<br>I learned that PETG prints are more difficult to remove from heatbed than PLA prints. Initial prototype seen left in cover photo shows that you risk holes if trying to remove too early.&nbsp;</p>