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
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
---
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