Little helper for cutting filament

I recently bought a Sunlu Filament Connector and in order to have the most even contact surface possible when connecting filaments, I designed and printed something like this.

The filament can be cut with a knife, razor or scalpel.

Printed on a Prusa MK4 printer in PLA, 30% infill. The hole diameter is 2.1mm. The filament should go in without any major problems.