Puffco HotKnife Gridfinity holders.
Single and Double options. To get the hot knife out simply press on one of sides, it will pop out.
I printed with 15% infill.
.20 layer height
Update (1/8/2024): Mistake uploading them labeled as 4U sizes instead of 6U, adjusted file names but you might see references to 4U in slicer.