Thumbscrew bolt head for flanged axle
thingiverse
The flanged axle knob needs a thumb-sized grip. Blue painter's tape rolls are too bulky to slide into the dispenser through the notch, so you have to unscrew the axle bolt with ease. It would be simpler if it were integrated into the flanged axle, but I'd rather take a chance on getting hurt than tamper with a .STL file. Printing the original flanged axle at 100% for the axle and 97% for the bolt makes threading easy. The thumbscrew component is designed to fit snugly onto the 97% bolt. It will match perfectly with the 100% axle if you print it at 102-103%. A small dot of superglue is all it takes to secure the attachment.
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