5 model

Free

test-tube rack

Thingiverse

Free

test-tube rack "snake"

Thingiverse

Free

PC4-M10 Tube Holder for Server Rack Enclosure

Thingiverse

Free

15 mL magnetic tube rack

Thingiverse

Free

2ml Microcentrifuge Tube Rack Eppendorf Stand (10 Positions)

Thingiverse