3Doodler 3D Pens and the Refills and Cases That Fit Them

Best for
Start+ owners wanting a black hard case

The Hard Case for 3 Doodler Start is made by Perfcaze, not 3Doodler, and is designed for the 3Doodler Start+ Essentials pen from the 2023 and 2024 releases, plus its filament refill blister packs. Inside, a molded grooved base and two elastic bands hold the pen in place so it does not rattle around in a backpack. A mesh pocket stores spare refills, a USB cable or small tools.

The shell is hard EVA, described as shockproof, drop-resistant, waterproof and dustproof, and closes with a zipper. It measures 7.48 by 3.92 by 2.95 inches, comes with a detachable hand strap and carries a one-year warranty. It is the case only. Because it is shaped around the Start+, the listing does not claim it fits the Flow, so do not buy it for that pen. Choose it for a no-fuss black case; the co2CREA case suits kids who want color and extra padding.

• Molded interior with two elastic bands
• Mesh pocket for refills and cable
• 7.48 x 3.92 x 2.95 inches

Best for
Teens and adults making figures and cosplay

The 3Doodler Flow 3D Printing Pen is the centerpiece. It works with 1.75mm plastic filaments including PLA, ABS and wood, and an integrated LCD shows the temperature in real time so you know when the nozzle is ready. Setup is simple: plug it in, load 3Doodler Flow plastic, wait for it to heat and start drawing freehand or over stencils.

In the box are eight colors of plastic spools totaling 80 feet and an activity guide book; the title also mentions a stencil book. The pen measures 3.1 by 10.74 by 4.44 inches in its listing and weighs 15.8 ounces, which likely includes packaging. Oddly, the spec block lists compatibility with a personal computer and STL and OBJ file formats, while the features stress that no software is needed. We read the features as correct: this is a hand-held pen, not a desktop printer. Pick the Flow if you are a teen or adult who wants to build real 3D shapes and work with common filaments. For younger children, the low-temperature Start+ ecosystem that the other products serve is designed around PCL.

• LCD real-time temperature display
• Takes 1.75mm PLA, ABS and wood filaments
• 8 colors, 80 feet of plastic included
• Activity guide book in the box

Best for
Start+ users wanting the most colors

The 320 Pcs 32 Colors 3D Doodler refill set comes from EunoiaLabs and is built only for the 3Doodler Start+ pen. The pen is not included. It supplies 2.5mm low-temperature PCL filament in 32 colors, 26 standard and 6 glow in the dark, with 10 strands per color for 320 total. Each strand is pre-cut to 6 inches, so there is no trimming.

Every color sits in its own resealable bag to keep the filament dry, the material is described as non-toxic and odorless, and a drawing book with 12 templates is included. It weighs 300 g. This is the biggest color range here, ideal for a Start+ household making rainbow figures or glowing nightlights. It will not work with the Flow, which uses 1.75mm filament.

• 32 colors including 6 glow in the dark
• 320 pre-cut 6-inch strands
• Drawing book with 12 templates

Best for
Start+ users wanting light and glow shades

The Kretrum 25 Colors 250 Strands 3D refill pack is another Start+ only product. It uses 2.5mm PCL in 25 colors: 17 common shades, 4 glow colors and 4 light colors, with 10 strands each for 250 total. The listing repeats, emphatically, that it will not fit any other brand or 3D pen.

Packaging is resealable, the listing says each strand is quality checked before packing, and it weighs 220 g. It does not mention a drawing book, and the spec block lists 25 packs while describing 250 items, which is consistent with 10 strands per pack. Choose it if you like pastel light shades; choose the 320-piece set for more colors and the included template book.

Best for
Kids wanting a colorful protective case

The co2CREA Hard Case for 3Doodler Start+ takes a more protective approach, with three layers: a nylon exterior, an EVA shell and a soft velvet interior. Inside there is a snug 1:1 compartment for the Start+ Essentials pen, elastic straps and a mesh pocket for refills. A zipper and soft wrist strap make it easy to carry to school or a workshop.

The listing mentions the Flow in passing within its marketing text, but the fit it describes is specifically for the Start+ Essentials set, so we would not count on it holding a Flow. Dimensions are not specified. It is a case only, and the mint and orange colorway makes it the friendlier choice for kids.

• Nylon, EVA and velvet layers
• 1:1 pen compartment with elastic straps
• Mesh pocket and wrist strap