My wife wanted a device to hold a normal thread bobbin onto a Bernina bobbin. I opened Design Spark Mechanical and quickly whipped up a drawing for two different thread bobbins:
There are two different length spools and they both have different sized diameters, hence the need for the two pegs. The pegs will hold the black bobbin onto either of the different sized spools.
You can download the pegs from Thingiverse here: https://www.thingiverse.com/thing:3814617
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