Couch tray
thingiverse
Simplistic tray for you armrest. The other is with 10cm wide cut for coaster. Made to fit 21cm wide armrest very firmly and the plate is 5mm thick thorough so you can count your adjustments from there when changing the size with slicer. Print on its side. Id suggest using some adhesion i printed mine with raft to reduce warping of the wood filament i used.
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