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Products and Services
The Spacer Eraser is a precision-engineered replacement plunger end for standard 3 mL peptide-style injection pens, designed to completely eliminate the need for traditional spacers such as plastic o-rings or glued-on 3D-printed inserts.
Conventional spacer solutions are messy, inconsistent, and easy to lose during cartridge changes. The Spacer Eraser solves all of that by directly replacing the stock plunger end, extending the internal mechanism to allow the cartridge stopper to be fully depressed—so you can finally use the entire cartridge volume with zero waste.
Each unit is 3D-printed in high-quality PLA for a precise interference-fit connection. Installation takes seconds: simply pop off the original plunger end and snap this one in its place—no glue, no tools, no frustration.
Compatibility
V1, V2, and V3 pen models
Common “white-body” pens sourced from Alibaba
(Compatibility with other models not yet confirmed)
Key Features
✅ Replaces spacers — no more o-rings, glue, or loose inserts
✅ Extends plunger reach to eliminate wasted product
✅ Precision press-fit for a secure, tool-free install
✅ Durable, reusable PLA construction
✅ Available in multiple color variants and custom dual-tone options
✅ Designed & made in the USA by Print & Prosper
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Variants & Ordering
📦 Minimum Order: 10 Spacer Erasers per pack
Available Options:
Solid Assortment (10 Pack): Mixed solid colors from current stock
Single-Color 10 Pack: Choose one color from the variant menu
Dual-tone Assortment 10 Pack: Mixed dual-tone colors from current stock
Random Assortment 10 Pack: Mixed solid and dual-tone colors from current stock
Build Your Own Assortment 10 Pack: Specify your preferred colors at checkout or via message, can be a selection of current stock, or you can request colors and combinations that sre not currently listed
Each order is packaged in a protective bubble mailer with an inner zip-lock pouch.
Material: PLA (3D printed)
Use: For extending pen plungers only — not for medical or injection use
3ml Insert shown in pictures as reference only!
Organize your Apache 2800 case with this custom 3D-printable tray insert. Designed to hold 10ml vials securely, this model creates a professional-grade honeycomb organizer that maximizes space and keeps your gear safe.
This listing is for a DIGITAL STL file only. No physical product will be shipped.
✅ Features
- Sized specifically for the Harbor Freight Apache 2800 case
- Holds 42 10ml vials with labels
- Honeycomb layout with 2mm wall thickness for strength
- Print as many trays as you need — 4 will fill the entire case, can be stacked with 3ml trays
- Tested and confirmed fit
- "Easy-Pick" handle in the center of the tray
- Interlock : trays "lock in" to the bottom of the tray above it to prevent shifting
📂 What’s included
- STL file (zipped)
- ReadMe with recommended print settings and licensing terms
🖨 Recommended print settings
- Material: PLA, PETG, or ABS
- Layer height: 0.25 mm
- Infill: 0% grid
- Bed only supports required
- Print time: ~6 hours per tray
- Filament usage: ~160 g per tray
Notice! Images are for feature reference and may display a different model or previous version!
⚠️ License
- For personal use only
- File cannot be redistributed, resold, or used commercially to sell prints
Due to the digital nature of this product, refunds cannot be issued once the file has been downloaded.
Organize your Apache 3800 case with this custom 3D-printable tray insert. Designed to hold 3ml vials securely, this model creates a professional-grade honeycomb organizer that maximizes space and keeps your gear safe.
This listing is for a DIGITAL STL file only. No physical product will be shipped.
✅ Features
- Sized specifically for the Harbor Freight Apache 3800 case
- Holds 65 3ml vials with labels
- Honeycomb layout with 2mm wall thickness for strength
- Print as many trays as you need — 12 will fill the entire case
- Tested and confirmed fit
- "Easy-Pick" handle in the center of the tray
- Interlock : trays "lock in" to the bottom of the tray above it to prevent shifting
Important note, case will hold 2 trays vertically with the lid foam and the bottom foam in place. It will accommodate 3 trays vertically with only to top foam in place, but the top foam may need to be removed to prevent excess pressure and possible deformation of the trays.
📂 What’s included
- STL file (zipped)
- ReadMe with recommended print settings and licensing terms
🖨 Recommended print settings
- Material: PLA, PETG, or ABS
- Layer height: 0.25 mm
- Infill: 0% grid
- Bed only supports required
- Print time: ~6 hours per tray
- Filament usage: ~160 g per tray
Notice! Images are for feature reference and may display a different model or previous version!
⚠️ License
- For personal use only
- File cannot be redistributed, resold, or used commercially to sell prints
Due to the digital nature of this product, refunds cannot be issued once the file has been downloaded.
Organize your Apache 2800 case with this custom 3D-printable tray insert. Designed to hold 3ml vials securely, this model creates a professional-grade honeycomb organizer that maximizes space and keeps your gear safe.
This listing is for a DIGITAL STL file only. No physical product will be shipped.
✅ Features
- Sized specifically for the Harbor Freight Apache 2800 case
- Holds 91 3ml vials with labels
- Honeycomb layout with 2mm wall thickness for strength
- Print as many trays as you need — 4 will fill the entire case, 6 with modifications to the case
- Tested and confirmed fit
- "Easy-Pick" handle in the center of the tray
- Interlock : trays "lock in" to the bottom of the tray above it to prevent shifting
Important note, case will hold 3 trays vertically, but removal all foam and plastic moldings in lid is necessary. See pictures for reference
📂 What’s included
- STL file (zipped)
- ReadMe with recommended print settings and licensing terms
🖨 Recommended print settings
- Material: PLA, PETG, or ABS
- Layer height: 0.25 mm
- Infill: 0% grid
- Bed only supports required
- Print time: ~6 hours per tray
- Filament usage: ~160 g per tray
Notice! Images are for feature reference and may display a different model or previous version!
⚠️ License
- For personal use only
- File cannot be redistributed, resold, or used commercially to sell prints
Due to the digital nature of this product, refunds cannot be issued once the file has been downloaded.
About
our company
Print & Prosper provides digital planners, peptide trackers, and 3D-printed tools to help people stay organized and take control of their health. Our focus is on creating accessible, practical resources that support everyday success.
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