Simple mask to use for prints. Better with higher infill to make it a bit heavy. Print five "doors" to use it as test strip maker, glue handle on top.
https://cad.onshape.com/documents/529e684ff71d2687782535c0/w/ff41b06d1f7ec48259648548/e/cdb270c29bd6a2b5e24b4dc0
The author marked this model as their own original creation. Imported from Thingiverse.