> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # Pololu Ball Caster with 1″ Plastic Ball and Plastic Rollers **Type:** Product page · **SKU:** POLOLU-2691 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/pololu-ball-caster-with-1-plastic-ball-and-plastic-rollers.html ([markdown](https://core-electronics.com.au/pololu-ball-caster-with-1-plastic-ball-and-plastic-rollers.html.md)) This ball caster uses a 1″ diameter plastic ball and has an overall height of 1.1″ (29 mm). The two-part housing snaps together to securely enclose the ball and three plastic rollers that reduce the friction between the ball and the ABS housing. The base piece of the housing has holes for three #4 or M3 screws (not included). ## Pricing - **Price:** $9.75 (inc GST) — $8.86 AUD, exc GST - **Quantity discounts:** 10+ $8.51 (exc GST) · 25+ $8.25 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 2 today, and up to 350 more in 4–7 days. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-2691:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/POLOLU-2691:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description This ball caster is an improved version of Pololu's original [Pololu Ball Caster with 1" Plastic Ball](https://core-electronics.com.au/pololu-ball-caster-with-1-plastic-ball.html); Pololu recommend this new version over the older version for all applications that are not somehow specifically tied to the previous design. | [![](https://core-electronics.com.au/attachments/localcontent/0J6615_2116327557a.jpg)](https://core-electronics.com.au/attachments/localcontent/0J6615_4757939284a.png) | |---| | Assembling the Pololu Ball Caster with 1" Plastic Ball and Plastic Rollers (screws not included). | This ball caster kit includes a two-part black ABS housing, a 1" diameter POM (also know as acetal or by the brand name Delrin) plastic ball, and three ABS rollers. When assembled, the ball caster is capable of rolling in any direction with low friction, making it suitable for use as a third contact point for wheeled, differential-drive robots weighing up to around ten pounds. | [![](https://core-electronics.com.au/attachments/localcontent/0J6609_18234b32e28.jpg)](https://core-electronics.com.au/attachments/localcontent/0J6609_27036e42770.jpg) | |---| The base piece of the housing has holes for three #4 or M3 mounting [screws](https://core-electronics.com.au/hardware/screws-nuts.html) (not included) and slots for the three rollers. The second part of the housing snaps into the base piece to secure the ball and rollers. The assembled ball caster has an overall height of 1.1" (29 mm). | \| [![](https://core-electronics.com.au/attachments/localcontent/0J6607_510835d9a1.jpg)](https://core-electronics.com.au/attachments/localcontent/0J6607_39781e1c4e9.jpg) \| \|---\| | \| [![](https://core-electronics.com.au/attachments/localcontent/0J6608_9188eaf589.jpg)](https://core-electronics.com.au/attachments/localcontent/0J6608_571137d035f.jpg) \| \|---\|---\| | |---| This ball caster is also [available with ball bearings](https://core-electronics.com.au/pololu-ball-caster-with-1-plastic-ball-and-plastic-rollers-46014.html) instead of plastic rollers for smoother performance. **Dimensions** | [![](https://core-electronics.com.au/attachments/localcontent/0J6614_447136e9b1e.jpg)](https://core-electronics.com.au/attachments/localcontent/0J6614_59385f4ea27.png) | |---| | Dimensions of the Pololu Ball Caster with 1" Plastic Ball and Plastic Rollers. Units are mm over \[inches\]. | This dimension diagram is also available as a downloadable PDF (133k pdf). **Comparison of Pololu ball casters** | [![](https://core-electronics.com.au/attachments/localcontent/0J6616_206725e12f0.jpg)](https://core-electronics.com.au/attachments/localcontent/0J6616_15804c1ec4a.jpg) | |---| | Pololu ball casters with plastic and metal balls. Ball diameter from left to right: 1", 3/4", 1/2", and 3/8". | | Pololu ball caster ball diameter | height with no spacers | distance between screw holes | weight with no spacers or screws | |---|---|---|---| | [3/8" plastic ball](https://core-electronics.com.au/pololu-ball-caster-with-3-8-plastic-ball.html) | 0.40" | 0.53" | 0.03 oz | | [3/8" metal ball](https://core-electronics.com.au/pololu-ball-caster-with-3-8-metal-ball.html) | 0.40" | 0.53" | 0.14 oz | | [1/2" plastic ball](https://core-electronics.com.au/pololu-ball-caster-with-1-2-plastic-ball.html) | 0.53" | 0.58" | 0.07 oz | | [1/2" metal ball](https://core-electronics.com.au/pololu-ball-caster-with-1-2-metal-ball.html) | 0.53" | 0.58" | 0.32 oz | | [3/4" plastic ball](https://core-electronics.com.au/pololu-ball-caster-with-3-4-plastic-ball.html) | 0.88" | 0.24" | 0.25 oz | | [3/4" metal ball](https://core-electronics.com.au/pololu-ball-caster-with-3-4-metal-ball.html) | 0.82" | 0.61" | 1.05 oz | | [1" plastic ball, ball bearings](https://core-electronics.com.au/pololu-ball-caster-with-1-plastic-ball-and-plastic-rollers-46014.html) | 1.10" | 0.48" | 0.65 oz | | [1" plastic ball, plastic rollers](https://core-electronics.com.au/pololu-ball-caster-with-1-plastic-ball-and-plastic-rollers.html) | 1.10" | 0.48" | 0.58 oz | | [1" plastic ball (old version)](https://core-electronics.com.au/pololu-ball-caster-with-1-plastic-ball.html) | 1.10" | 0.70" | 0.36 oz | **People often buy this product together with:** | [![Pololu Ball Caster with 1/2](https://core-electronics.com.au/attachments/localcontent/0J9810_2216be9254.jpg)](https://core-electronics.com.au/pololu-ball-caster-with-1-2-plastic-ball.html) | [Pololu Ball Caster with 1/2" Plastic Ball](https://core-electronics.com.au/pololu-ball-caster-with-1-2-plastic-ball.html) | |---|---| | [![Pololu Ball Caster with 3/4](https://core-electronics.com.au/attachments/localcontent/0J9806_2082e85f07.jpg)](https://core-electronics.com.au/pololu-ball-caster-with-3-4-plastic-ball.html) | [Pololu Ball Caster with 3/4" Plastic Ball](https://core-electronics.com.au/pololu-ball-caster-with-3-4-plastic-ball.html) | |---|---| | [![Pololu Micro Metal Gearmotor Bracket Pair - Black](https://core-electronics.com.au/attachments/localcontent/0J1128_293715d398.jpg)](https://core-electronics.com.au/pololu-micro-metal-gearmotor-bracket-pair-black.html) | [Pololu Micro Metal Gearmotor Bracket Pair - Black](https://core-electronics.com.au/pololu-micro-metal-gearmotor-bracket-pair-black.html) | |---|---| **Dimensions** | Ball diameter: | 1 in | |---|---| | Weight: | 16.5 g | **General specifications** | Ball material: | plastic | |---|---| **File downloads** - **Dimension diagram of the Pololu Ball Caster with 1" Plastic Ball and Plastic Rollers (133k pdf)** - **3D model of Pololu Ball Caster with 1" Plastic Ball and Plastic Rollers (2MB step)** ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/p/o/pololu-2691-1.jpg)