Printrbot Simple Metal filament spool rack for small (25mm hole) center spools

Spool Rack for Printrbot Simple Metal for smaller diameter (25mm hole) filament spools - with mount-screw countersink to prevent spool rib snags

I ordered Sainsmart flexible TPU from Amazon and was pleased to find that it included a spool (earlier reviews of the product indicated it did not used to). The spool is small and the inside diameter is about 25mm. It would not fit on the rack that came from Printrbot.

I designed this replacement as a re-mix of their design with a smaller, rounde