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UM2 two-piece printhead
Don't print in PLA it will warp.
I printed it in Polycarbonat but ABS should be fine.
The linear bearing should click in. If there is a gap between the 2 pieces the bearing is not fully inserted. Depending on your print quality you can cut the 2 top points of the bearing alignments on both parts because they tend do build a small knob at the end.