FEIN MultiMaster MM 500 Plus Top: problems, parts and running costs

Checked: 2026-10-17

Summary

No Top-specific failure mode with owner attribution has been reported; the friction points are a blade-clamping system that owners say pushes buyers toward FEIN-brand blades, a bulky anti-vibration body with a dial instead of a paddle trigger, and warranty claims that need the whole tool with the original receipt. Running costs are consumable E-Cut blades, rasps, scrapers and sanding sheets sold separately. It is a good buy at dealer list prices in the $200-270 band when the 30+ accessory set matters, and poor value above $270.

Common problems and fixes

Blades lock to FEIN-brand accessories — owners on the sibling MM 500 Plus kits call the newer clamping system “terrible” and say it appears designed to force FEIN-blade purchases; the Starlock mount also accepts select other-brand multi-tool accessories, so owners can switch brands as a workaround. Not a warranty matter. [1]
Warranty claims need the whole tool — a claim requires the entire tool with the original receipt, and FEIN’s warranty statement says partially or completely dismantled tools cannot be sent in; coverage is 1 year standard, extended to 3 years if the tool is registered online within 3 months of purchase. [2][8]
Gypsum dust clogs the switch element — after cutting gypsum-containing material, FEIN says gypsum dust can harden with humidity and impair the switching mechanism; blow out the ventilation openings and the switch element with dry, oil-free compressed air. [3]
Manual troubleshooting covers start and cutting faults — the family manual lists tool-does-not-start (check power supply, cord, switch), reduced cutting performance (dull or wrong accessory, excessive pressure) and excessive vibration or noise (loose or damaged accessory, internal issue). [3]
Ergonomics tradeoff — reduced vibration comes with more bulk and a dial and switch instead of a paddle trigger, which owners find less convenient. [6]
Older same-family tools overheat — owners of much older vintage Fein MultiMasters report heat buildup bad enough to require leather gloves after about 15 minutes; this concerns a 636 model and does not transfer to the MM 500 Plus Top. [7]
Incorrect specs in third-party listings — several aggregator pages swap the minimum oscillation rate, show a 72 dB sound figure instead of FEIN’s 75.6 dB, or render the 2 x 1.7-degree angle as 3.4 degrees; check FEIN’s own page before trusting seller copy. [4]

Parts and consumables

Carbon brushes — listed as replaceable in UK retail copy for the 110 V SKU, indicating a user-replaceable wear part; no US spare-parts listing for brushes was found. [4]

Yearly running cost

No owner-reported yearly total is available. The recurring cost is consumables: E-Cut Long-Life and Carbide Pro blades, carbide rasps, rigid scrapers, sanding pads and sanding sheets all wear out and are sold separately, with third-party 10-packs of E-Cut Long-Life blades available for the family. Beyond warranty, FEIN service-part or repair costs through its spare-parts catalogue and repair service apply. [4][5][9]

When it is a good buy

At $269.95 list from a US dealer (2026-10) it sits in the fair-to-good band where the accessories are the value, since the motor is identical to the bare tool. [4][5]
At $369.95 at Home Depot (2026-10, out of stock at the check; shown as $319.95 after a $50 card discount) the value thins for a 350 W corded tool. [4]
FEIN MultiMaster MM 500 Plus (bare, $199.95 at Home Depot, 2026-10) — the better choice when you already own FEIN accessories and only need the motor. [5]
FEIN MultiMaster MM 700 Max ($249.95 at Home Depot, 2026-10) — the better choice when you want more power in FEIN’s corded range without paying Top-kit pricing. [5]