I am beyond late to this but can you stick this to the back of the picocalc while you’re using it?
Not with the one above, but you can with the one in this thread:
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Printed from transfluent PETG 0.2 layer and 0.4 hotend. For me really not good fit. Rails just need a lot of postprocessing and still too tight. So waste of poor petg 
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I used JLCPCB to print this model using SLA(Resin). It came to less than CAD$5 shipped using my welcome coupons. I am very happy with the quality of the print.
I needed to sand down the rails depth and thickness but it fits great now. I also finished the part (sanded) but only put in reasonable effort so it wasn’t so rough. You can also get JLCPCB to finish it for you, but that cost more.
Ignore the finger prints!
I printed mine in PLA on an Ender 3 V3 SE, had to remove the rubber pads I had installed but otherwise works great. Nice fit.