FreeA simple Ender 3 spool holder; it will fit any printer with a similar 20x20mm top frame profile.
Thingiverse
8.044 model
Free
Free2020 profile object with exact dimensions
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FreeDual spool holder for Ender-3 (and other printers with 2020 profile)
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FreeT-nut with M3 Nut for 2020 Alu profiles I-type (5mm)
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Free2040 profile object with exact dimensions
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FreeOLD! Strong Y-Carriage for MGN12 rails on 2040 v-slot profile with optical EndStop
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FreePrusa I3 bed regulator with low profile
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Free4040 profile object with exact dimensions
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FreePlywood Prusa i3 with 2020 profiles
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FreeLow profile ducted fan for Mendel90 with E3Dv4 hot end
Thingiverse
FreeMount for 30x30 aluminium profile compatible with GoPro / Modular Mounting System
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FreeCompact Bowden Extruder with 20-20 profile fitting
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Freeuniversal dial gauge holder for printers with 20x20 profiles
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Free20x20 Profile Mountable Threaded 1.75mm Filament Dust Filter with Bowden Couplings
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FreeEasy cable organiser with ties for 3030 and 2020 profile (insert and twist)
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FreeRaspberry Pi 2/3 (B/B+) relay server with 2020 profile attachment points (e.g. for OctoPrint, home automation, etc.)
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Free4040 extrusion profile solid with 10mm hole and connectors
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FreeLow profile E3D V5 40mm fan shroud with zip tie lock
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FreeV profile 2040 switch box with converter mount LM2596 (LED - light)
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FreeRaspberry Pi Mount for 2020 Profile (OctoPi with Kossel Mini)
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FreeLow profile Ender 3 PSU mount with relay and integrated octoprint PSU
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FreePulley (customizable, with lots of tooth profiles)
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FreeAnycubic Vyper V-Slot Cover and other Printers with V-Slot Profiles.
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FreeThe ARegoCW Tximy3D2 3D Printer, all axis trapezoidal screw design with aluminum T 2020 profile
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Free2020 Aluminum Profile Extrusion with 5 mm slot
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FreeX-axis Motor & Adjustable Endstop Mount for 2020 profile with 2 dampers
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FreeCover Ender 6 with Alu-Profile
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Free2020 profile handle (M5) with grip
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FreeConrol Box for Printers With 3030 Profiles / 4x20 LCD
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FreeLow Profile 40mm heatsink fan shround for FLSun i3 (with e3d v5)
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FreeMooseorama's CoreXY Printer with Profile Rails
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FreeY-axis Motor Mount with Dampers for 2020 profile on Y-axis
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FreeY-axis with linear rails for Tevo Tornado, direct mount with ordinary u-profile
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FreeJumping Sumo tire with profile
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FreeAdjustable foot with anti-vibration/slip pad for 3030 profile
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FreeRedBot Y-Carriage for MGN12 rails (2040 v-slot profile) with optical or mechanical endstop
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FreeSimplified Low-profile parametric Y-axis belt tensioner with ram
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FreeLED profile with diffusor 30° angle
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FreeBall filament holder with 2020 profile hook
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FreeVoron Afterburner low profile dual bowden Y-Splitter with quickdisconnect
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FreeLow profile Spool holder with Scale
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FreeCustomizable aluminium profile bracket with optional inverted z-motor mount
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FreeRaspberry Pi 2/B+ case with extrusion profile 30mm mounts
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FreeT-bolt converter for m4 machine bolts to mount things to 4040 profile with 10mm slots.
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FreeT Nut M5 with Slot Washer (45x45 Aluminium Profile)
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FreeFast attaching bracket with clip for 28mm alu profile
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FreeLow profile E3D V6 40mm fan shroud with zip tie lock
Thingiverse
FreeHolder for Raspberry Pi case with VESA 75 for 20mm Aluminum profile
Thingiverse