Can I use 1.75mm plastic?
No. The 3Doodler Create+ and PRO+ pens only work with 3Doodler-branded 3mm plastic strands. Likewise, the 3Doodler Start is only compatible with 3Doodler-branded Start Eco-Plastic filament, which are 2.5mm in diameter.
Plastics cannot (and should not) be combined. Use of other materials not approved by us may result in damage to your pen, and will void your warranty.